IAMTimelineGroup Interface

The IAMTimelineGroup interface sets and retrieves properties on groups in DirectShow Editing Services (DES).

A group contains one or more tracks, and possibly one or more compositions, which in turn contain source clips of a uniform type, such as video or audio. Groups are the topmost compositions in a timeline, and also expose the IAMTimelineComp interface. A timeline can contain multiple groups.

Each group has the following attributes.

• An associated media type.
• The frame rate at which the group renders, in frames per second (FPS). All edits occur at a time rounded to the nearest frame boundary, as defined by the group's FPS setting.
• A priority level, for writing files with multiple streams of the same media type (for example, a two-video-stream AVI file).

Requirements

Requires Qedit.h.

In addition to the methods inherited from IUnknown, the IAMTimelineGroup interface exposes the following methods.